Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Stretching or stretch forming
Patent
1995-05-24
1997-03-18
Sweet, Mark D.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Stretching or stretch forming
524609, 524367, 524108, 524110, B29C 5506, B29C 5508
Patent
active
056119852
ABSTRACT:
The present invention provides an improved solution casting method to manufacture, with high productivity, a polysulfone resin film superior in quality including appearance, surface smoothness, transparency and thickness accuracy. A polysulfone resin film is cast using the solution casting method in which a solution of polysulfone resin is cast on a support base to a desired thickness, dried to remove the solvent, and resultant resin film is peeled away from the support piece. The solution of polysulfone resin comprises at least one solvent chosen from among anisole, dioxane or tetrahydropyrane. To shorten the drying time even further, at least one solvent chosen from among acetone, methylethylketone, ethyl acetate, toluene and phenol can be mixed in the casting solution of polysulfone resin. The resultant polysulfone film obtained can be uniaxially stretched to produce a high-quality retardation film with superior optical properties.
REFERENCES:
patent: 3875096 (1975-04-01), Graefe et al.
patent: 5096585 (1992-03-01), Nguyen
patent: 5472538 (1995-12-01), Minakuchi et al.
Kobayashi Hitoshi
Saito Takao
Sekisui Chemical Co. Ltd.
Sweet Mark D.
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